/***************************************************************************
 * Copyright 2012-2013 TXT e-solutions SpA
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * This work was performed within the IoT_at_Work Project
 * and partially funded by the European Commission's
 * 7th Framework Programme under the contract ICT-257367.
 *
 * Authors:
 *      Salvatore Piccione (TXT e-solutions SpA)
 *
 * Contributors:
 *        Domenico Rotondi (TXT e-solutions SpA)
 **************************************************************************/
package it.txt.ens.namespace.osgi;

import it.txt.ens.namespace.NamespaceInquirer;
import it.txt.ens.namespace.NamespaceInquirerFactoryImpl;

import java.util.Dictionary;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedServiceFactory;

/**
 * @author Salvatore Piccione (TXT e-solutions SpA - salvatore.piccione AT txtgroup.com)
 * @author Domenico Rotondi (TXT e-solutions SpA - domenico.rotondi AT txtgroup.com)
 *
 */
public class NamespaceInquirerMSF implements ManagedServiceFactory{

    private static final String DESCRIPTIVE_NAME = "ENS Namespace Inquirer";
    
    public static final String PID = "ens-namespace-inquirer";
    
    public static final String OWNER_ID = "ens.namespace.inquirer.owner";
    
    private ConcurrentMap<String, NamespaceInquirer> services;
    private ConcurrentMap<String, ServiceRegistration<NamespaceInquirer>> registrations;
    private BundleContext context;
    
    public NamespaceInquirerMSF (BundleContext context) {
        this.context = context;
        services = new ConcurrentHashMap<String, NamespaceInquirer>();
        registrations = new ConcurrentHashMap<String, ServiceRegistration<NamespaceInquirer>>();
    }
    
    /* (non-Javadoc)
     * @see org.osgi.service.cm.ManagedServiceFactory#getName()
     */
    @Override
    public String getName() {
        return DESCRIPTIVE_NAME;
    }

    /* (non-Javadoc)
     * @see org.osgi.service.cm.ManagedServiceFactory#updated(java.lang.String, java.util.Dictionary)
     */
    @Override
    public void updated(String pid, Dictionary<String, ?> properties)
            throws ConfigurationException {
        //TODO refine control
        if (services.containsKey(pid)) {
            throw new ConfigurationException(null, "Cannot update an already configured Namespace Inquirer instance");
        }
        if (properties == null) {
            throw new ConfigurationException(null, "Properties cannot be null");
        }
        
        NamespaceInquirer service;
        try {
            service = new NamespaceInquirerFactoryImpl().create(properties);
        } catch (IllegalArgumentException e) {
            throw new ConfigurationException(null, e.getMessage());
        }
        services.put(pid, service);
        registrations.put(pid, context.registerService(NamespaceInquirer.class, service, properties));
    }

    /* (non-Javadoc)
     * @see org.osgi.service.cm.ManagedServiceFactory#deleted(java.lang.String)
     */
    @Override
    public void deleted(String pid) {
        services.remove(pid);
        registrations.get(pid).unregister();
        registrations.remove(pid);
    }

}
